[ANSS-netops] RT-130 GPS issue

[Kyle Persefield]

Dave,

On 30 June 2015 there was a leap second added.  I wonder if this has
something to do with this  problem.  I have not seen any issues with this
year's leap second, but we did have an issue at one time With the GPS-01s
back in 2008.  The GPS-02s are OK as far as I know.

-----Original Message-----
From: ANSS-netops [mailto:anss-netops-bounces at geohazards.usgs.gov] On
Behalf Of Dave Drobeck
Sent: Monday, July 06, 2015 12:31 PM
To: anss-netops at geohazards.usgs.gov
Subject: [ANSS-netops] RT-130 GPS issue

Hi All,
I'm having a mysterious problem w/ one station.   It had been working
fine for ~ 8 years, then recently the GPS clock stopped locking.  I
visited the site with complete replacement parts (DAS, GPS, cable).  I
finally got it to work w/ different DAS and original cable and GPS clock,
but it turned out that that was the last time it locked.  On-site what I
observed is that if I told the clock to go continuous it would turn on,
search, say it locked but reported 0 SVs, then turn off w/o syncing the
RTC.  After much fooling around and trial and error with GPS mode, cables,
DAS, clocks, I got the different DAS and original clock to to behave,
locked, reported 8 SVs, synced RTC, looked good.  Went home.
  Hasn't locked since.  Same behavior, I can turn the clock on via RTCC,
but the DAS reports it turns off again immediately w/o syncing the RTC.

The "good" news is I have reproduced the behavior in my shop, so I can
work here, but I haven't figured it out yet.  Has anyone else had this
problem - and a solution?  Thanks, Dave
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